Auxiliary switch for an electromagnetic switching device

Abstract

An auxiliary switch for an electromagnetic switching device with two pressure springs (2, 3) arranged outside of the axis of movement (1) of the contact bridge support (10), these pressure springs being supported in the manner of a two-armed toggle joint respectively with one end in respectively one of blind holes or the like formed on mutually opposite sides of the contact bridge support (10) and with the other end in respectively one of recesses provided in the housing sections (A, B) and exhibiting a negative return spring characteristic against the tensile force of the drive.

I claim: 
     
       1. Auxiliary switch for an electromagnetic switching device with a drive, said switch comprising, in a multipartite housing equipped with fixed contacts, a contact bridge support secured in its position by means of a pressure spring and movable against the spring force upon energization/nonenergization of the drive of the switching device, said contact bridge support being provided with bridge contacts, characterized in that two pressure springs each with an axis located outside of an axis of movement of the contact bridge support are supported in the manner of a two-armed toggle joint respectively with one end in, respectively, one of blind holes formed on mutually opposite sides of the contact bridge support and with the other end in, respectively, one of recesses provided in housing sections, and exhibit a negative return spring characteristic against the tensile force of the drive. 
     
     
       2. Auxiliary switch according to claim 1, characterized in that the bearing surface of the pressure springs at the contact bridge support is arranged so that the spring axes of the pressure springs in the hold condition (upon excitation of the magnet), extend almost perpendicularly to the axis of movement of the contact bridge support. 
     
     
       3. Auxiliary switch according to claims 1 or 2, characterized in that the recesses formed in the housing sections on the side associated with the contact bridge support exhibit a pass-through opening toward the topside of the housing, through which the pressure springs can be introduced with the housing being assembled. 
     
     
       4. Auxiliary switch according to claim 1, characterized in that the housing sections encompassing the contact bridge support can be connected with each other in a shape-mating fashion by means of detent lugs projecting along the parting joint at the housing walls of a housing section and associated detent grooves at the second housing section. 
     
     
       5. Auxiliary switch according to claim 2, characterized in that the housing sections encompassing the contact bridge support can be connected with each other in a shape-mating fashion by means of detent lugs projecting along the parting joint at the housing walls of a housing section and associated detent grooves at the second housing section. 
     
     
       6. Auxiliary switch according to claim 3, characterized in that the housing sections encompassing the contact bridge support can be connected with each other in a shape-mating fashion by means of detent lugs projecting along the parting joint at the housing walls of a housing section and associated detent grooves at the second housing section.